In this study, the effect of pre-treatments including alkaline, acid and hydrogen peroxide on continuous hydrogen and methane production was investigated. Two different substrates as potatoes and bean wastes were… Click to show full abstract
In this study, the effect of pre-treatments including alkaline, acid and hydrogen peroxide on continuous hydrogen and methane production was investigated. Two different substrates as potatoes and bean wastes were used. Pre-treatment showed positive effect on bio-hydrogen and bio-methane production; higher bio-hydrogen and bio-methane production results using pre-treated samples than the control bioreactors (without pre-treatment), were recorded. In case of potatoes wastes, the hydrogen yield ranged between 126.4 and 252.7 mL-H2/g-TVS using pre-treated samples compared to 58.7 mL-H2/g-TVS observed in the reference test. Pre-treated bean wastes showed hydrogen yield of 93.0-152.1 mL-H2/g-TVS higher than 53.3 mL-H2/g-TVS measured in the control test. In the second stage, average methane yield results of 322.9-507.1 and 284.3-462.6 mL-CH4/g-TVS higher than 198.6 and 124.3 mL-CH4/g-TVS measured for potatoes and bean wastes control bioreactors, respectively. The best results were observed using H2O2 pre-treatment. The energy production efficiency was improved by combining H2 and CH4 bioreactors.
               
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